Brake mechanism



(5. L.. SMITH BRAKE MECHANISM May 26,1925.

Filed Jan. 17, 1924 a Mum Ckozyel. J'mL'ZZQ,

ill

-rilay 26, 35 25.

OE VIRGIIBTIA;

- Ti) UNITE?) LY'IVELIA. A (301 BRAHE MECHANESBL iippiiaation filed January 17, 1824.

lii: it known that l, (ii-toner. ll. l fiil'l'ih n i of the l'nilrd Halos, um r m lrnl 'n lon. in lln- Dish-in, ol' Columhizh naro inrvut-od rvrlain now and useful lni iroi'rmunts in llr; u: Morlianisrnis of which In) 'l'olh'nyin g is a rpm-iiiration-- Ely wrntion rrlalos to brake mechanisms 'l'or whirlox and my purpose to prorido u ieinnplo moans which may easily be applied to ollikllllilllill designs of vehicle brake moi' animus. whl-rvhy braking prossurrs; upiliod l a loi'or common to from and roar hrulzo systems aro distributed livlwrrn sui-h 2x u=ms.

il'ilh (ho foregoing and other iuirposws in R'irw; my invention oonsisls in the uovol 'l'oaturrs of Construction, rom'oination and arrang'omonl. oi parts as will lro livroinal'lor now lull dosi-riliod. illustrated in tho :1"- wompanying drawings, and (lolimd in the. appundod claims.

in the drawings whoroin lllil, charavlvrs oi' rol'orcnro (lillOlC correspomling parts in rho svparalo views Figure 1 is an rlmation of a means omliodying lho norol and (assolitiul jl'ra'l urus of invention as appli'ad to tho i'oot oralie pi-ilul of an automobile for dislrilsuiing: the.

in-along {on-vs applied by said ln'aho pedal to from and roar l)1;ll ems; and

i igg'uro Z, a i onlargod view of a fraginenl l Figure l, i iho 'l'oot brake pedal and my forum dis- 1 moangarhvn thobrakos have llPtll initiall applied, and in dolled lines, a posiiion ol' the brake pedal and said means aflor tho lax-liking forces have been. fully applied and distributed.

Referring low to the drawings in detail, ll? dosigmalvs a in": he lover which may ho oian" uiialilo iwh-aign-and operated in any suiiahh or desired mannor, llio sumo living illuslrala-d in this instaxiro as a foot liralco podal haring' pivotal ronnoct'ion as at ll, with u lixvd support sou 11; a part of the as of an lllilUlHObllO, and having oonli'illil,

showing in full lineis a position Serial No. Gilififili.

oporalivo C(ll'lilCCllill '4 llir rolwiworm so that ho oin- 'orulir lovrr z iorenuniliouod i9 adapt oil l'o? opr-raling hm}: hrahos ol' (m-h lirnliu systrm sinniilanoouslri fl hr mriirular doign of llho brill-1o s wins to ho oporatml is ol roursr. immaivrmh lull [or roinrnionro l iai'o illustrated in part, a from brake systoni (UllFlll'liltill and adapted lo operate in accordion-o with the disrlosuro in my appliralion lilllhlill), and, in park a'roar hralio .5 \Sll1il 21:; rowrod by my latvut llllllk lzl. A drtailod dosrription of ihv front and roar lnalm sysivms tliorol'oro is unnorrssary oihrr than lo point out that lllL front i': 2 *iii inrludris a lovrr arm 'l-l upon rearward mowmoot ol' \rhirh 1hr lront hralios are applied. and lhal, lho'rvar a 'steni inrludus a lPWl arm 15 upon forward moioinoni' of whii-h tho roar lll'iliClS are applied through rounor-lions l5, l5 and .15.

Piroi'od lo lhu brake lever lll at the points 16 and ll, 1' -51' :l;i\'(+l. is a.- pair of lowiarms 18 and ll) joined at their =0 ends by a link 2U, lho length of wliii'h, mtwcon 'rls points of pirmal CUHHPL'iZlOH 21, '32, rospm lively, with His lcwr arms is equal to the dislanco between the pivots .16, ii, so that, Said lover arms in roniunoiioi'i wilh thev brake jirdnl and tho link ill "form a parullrlogrum. I

'jho aofuatingg rod 23 for rho roar lllfllil system lSfPlVlJi'QLl at oncond to the lover I? and at liiv other end to llie aforesaid paralhfilogram at tho-pivot ill, while the actualing rod 24; for the front lil'illil system is; pi'i'olod at one end to the lever 14 and at itR other 0nd o the parallelogram al the pivot 22. v

The ope 'ation of the mechanism is as follows: The l) 'alie lever 10 is pressed downward about its pivot 11 from tho position of i igruro l, for inslanrv, to ho l'nll lino maiion ol hrl' ontand roar (ill ressures will be transmited from the brake lever through the parallelogram without the elements of the latter changing their relative positions. On the other hand, assuming that the relative adjustment of the front and rear brake systems is such that a lesser amount of movement of rod 23 is required to apply the rear brakes than the amount of movement of rod 24 to apply the front brakes, it is apparent that upon a predetermined amount of de ression of the brake lever 10, the rod 23 Wi I be moved to apply the rear brakes before the frontbrakes are applied. It follows, therefore, that since an application of the rear brakes restricts further forward movement of the pivot 21, con tinned depression of the brake lever 10; will-result in a partial collapse of the purab lelogram to the position 16-21-22-l7 with conse uent rearward movement of the pivot 22, w rich collapse will continue until the front brakes become applied. As both front and rear brakes begin to tighten a compressive force will be built up in link 20 which will produce a forward tension on the actuating rod 23 and a rearward tension on the actuating rod 24:. It is evident that the tension on the actuating rod will. be equal to the horizontal component of the compression in the lever arm 18 plus that in the link 20 and that the tension on the actuating rod 24; will be equal to the horizontal component of the tension in the lever arm 19 plus that in the link 20. .As the lever arms 18 and 19 are parallel and resist equally the reactions on them, it follows that the tensions on the two actuating rods must beequal, each being composed of two equal forces plus a force common-to both acting through the link 20. On the other hand, if the relative adjustment of the frontand rear brake systems is such that a lesser amount of movement of rod Qi is required to apply the front brakes than the amount of movement of rod-28 to apply the rear brakes, the operation of effecting equalization of brake pressures will be just the reverse. While the relative arrangen'rent of the brakes, the brake lever and the force distributing means is such that the rods 23, 2% do not always remain parallel (a condition necessary to perfect equalization) the rods 23, 2d are relatively long and their angular movement so slight that the equulination is sufficiently accurate for all practical purposes.

I claim 1. The combination of a pair of members forces to said members Ior transmission against said resistances, and a swinging arm and link system on. the lever operatin to distribute said forces through the mem ers against said resistances.

2. In an automobile front and rear wheel brake system, the combination of a pair of members for respectively forces to the front and rear brakes of the system, a lever for imparting forces to the members for transmission to the front and rear brakes respectively, and a swinging arm and link system on the lever operating to distribute said forccs through the members to said brakes.

3. The combination of a pair of members for respectively transmitting forces against separate resistances, a lever for imparting forces to said members for transmission against said resistances, and a swinging arm and link system on the lever operating to equally and simultaneously distribute said forces through the members against'said resistances.

4-. The combination of a pair of members for respectively transmitting forces against separate resistances, a lever for imparting forces to said members for transmission against said resistances, a pair of arms pivoted to said lever and having said members respectively pivoted thereto, and means between said arms cooperating with the latter to distribute said forces through the members against said resistances.

5, In an automobile front and rear wheel brake system, the combination of a pair of members for respectively transmitting forces to the front and rear brakes of the system, a lever for imparting forces to the members for transmission to the front andrear brakes respectively, a pair of arms pivoted to said lever andahaving said members respectively pivoted thereto, and means between said arms cooperating with the latter to distribute sald forces through the members to said brakes 6. The combination of a pair of members for respectively transmitting force against separate resistances, a lever for imparting forces to said members for transmissionugamst said resistances, a

pair of arms pivoted to said lever and having said members respectively pivoted thereto, and a link connecting said arms and cooperating therewith to distribute said forces through the members against said resistances.

In testimony whereof I hereunto afiix luv signature.

' GEORGE L. SMITH.

transmitting Ill) 

